Two girls set up a lemonade stand in Pierre, S.D., to raise $6,000 for their dad's cancer treatment.

KCCR radio reported that 8-year-old Sydney Youngberg and her 10-year-old sister, Rylee, spent Tuesday selling lemonade with the proceeds going to help with Mike Youngberg's travel expenses to Minneapolis.

Mike Youngberg has been diagnosed with a brain tumor after being cancer-free for 12 years. Doctors found the cancer after he was stricken with an aneurysm on June 3.

Hundreds of residents dropped off fistfuls of money and the girls became sensations on Twitter and Facebook.

The girls' mother, Jen Youngberg, says the family is overwhelmed by the response. She says the donations are more than enough to help pay for the family's trips to Minneapolis for Mike's cancer treatment.